diff --git a/common/BaseObjectData.hh b/common/BaseObjectData.hh
index fca763b45c3369d40b30e811d5faf193fc4a9037..82abfba5f2f0c40faf3f5099e3c78d736a1bc986 100644
--- a/common/BaseObjectData.hh
+++ b/common/BaseObjectData.hh
@@ -194,6 +194,7 @@ class DLLEXPORT BaseObjectData : public BaseObject
     /// get a pointer to the materialnode
     MaterialNode* materialNode();
     
+    /// get a const pointer to the materialnode
     const MaterialNode* materialNode() const;
     
     /// get a pointer to the bounding box node